1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcace18bc68f6631810316b9f39939587b0dab0baf7a64e14d6a4c580c07a7c8a. Chain 2 (Bitcoin): anchored in block 953924 (2026-06-16T09:52:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1d36f8e8-5e2d-4569-be02-4bc231240b2f.json and https://artists.proofprofile.net/proofs/artist/1d36f8e8-5e2d-4569-be02-4bc231240b2f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154bb862b0afc9cbe39a8594ce2061145963711bd30650b5fa9e8eaa57112d38. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPB602066979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22053e8790fcfb770f960a2adc8972158b8c505c5ba86a48592d808f011e7a00. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPB602066980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7afd690e76c0864f5db49c76b99c67feaee967baf406ed43d1cf917bdc1bf18. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPB602188751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf8deb2b3f658eba814a18765d974b22a3372c667b2cc52781af99015a1b407. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZJRC1969336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6148201d12ae1a97e7d3ee33e95d7d309757ba07e629f6ba56e6751505e1f30c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZS662200233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4210fbbf2c009b97343533abf1a70eba18d841afb8058d8c6d63fff3ff137c7. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZS642216038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec1ad7684b7baba6f1e0c2fc596f35e62a5b7882cd3af4967a27cf6c401300e. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMHK2202159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3252121869d0c3cd3b7c3d197d85d9a4bc5cde33f815e0cd6d55421bd0dacdf6. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMHN2222771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b76b4915df8517040f7ff34c79682b4794aaf2e481cf60e43fff23b8af64198. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZS672207262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf3b048ec5e63d2f295e9fe60793dea17537ef59f4e88559e87318356aeee52a. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZS672289547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9944f9ad6e6b8fd96da18e248708ac80cdf2131045cbdc6d9717a8ff2cdf2fe5. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZS652293282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe943e224590887e0c273f3e1ecebf0eaff0dc038eb7625a273c4d6b273e7692a. Chain 2 (Bitcoin): anchored in block 960355 (2026-07-31T05:49:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMHL2443810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae92b7abfcf4f7848495403e12d8d26001e48e17f129387bd0a65d066e5e3b3e. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM42K2431458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ce940b48ddb5292183f20bfeff315e3395d620a6b9f1429ecf572db3dbcafa8. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM42K2491778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8308f5cbf40a257eb86f1edb4e562fdb957de16e871bbaafdfc548c1dc95206b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZS652488898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd1842613702fa86347cec24651215db020f639b267ec5ef28e5c1ff00c5c5e1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZS652423971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96527e34a0ff68d2ee2b8005960018093a3458e8b8753938105339d6508b82a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZS672465878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5672e8e5b9fff5a172f4a5ac7a27d4e62743c6ce94800caea6e4ba7915b02f56. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMHN2488434.